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Abstract

When using sawtooth generators driven by clock pulses, it is necessary to provide the generators with a protection circuit for preventing the sawtooth waveform amplitude from exceeding a predetermined maximum value when clock pulses disappear or the time period between two successive pulses becomes too long. The circuits shown in the figures are designed to clamp the generator output to a low voltage when a clock failure occurs.

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Sawtooth Generators with Clock Failure Protection

When using sawtooth generators driven by clock pulses, it is necessary to
provide the generators with a protection circuit for preventing the sawtooth
waveform amplitude from exceeding a predetermined maximum value when
clock pulses disappear or the time period between two successive pulses
becomes too long. The circuits shown in the figures are designed to clamp the
generator output to a low voltage when a clock failure occurs.

In the circuit shown in Fig. 1, during normal operation, the thyristor comprised
of transistors T2 and T3 is off, and a sawtooth waveform is produced at the
collector of transistor T1. When voltage VS1 exceeds a threshold value equal to
Vref 1 + Vbe (T2), the thyristor is latched on and capacitor C1 discharges to
ground. The values of resistors R1, R2, and R3 are selected to have then VS1
approximately equal to -0.3 V to prevent the collector base junction of transistor
T1 from conducting. When a clock pulse reappears, the thyristor T2-T3 is latched
off by transistor T4.

In the circuit shown in Fig. 2, during normal operation, transistors T6 and T11
are off, and a sawtooth waveform is produced at the collector of transistor T5. As
soon as voltage VS2 reaches a threshold value equal to Vref 2 + Vbe (T11),
transistor T11 turns on, the latch comprised of transistors T7-T10 is set, and
transistor T6 turns on and simultaneously clamps the sawtooth waveform
amplitude to zero. As soon as a clock...